Flora of New Zealand Series

Holotype: New Zealand. Campbell Island, Rocky Bay, rocks (mostly limestone), 15–30 m, 14.i.1970, R.C. Harris 5347 – MSC.

Description : Thallus crustose, effuse, areolate, pale lead-grey, 0.15 mm thick, without a marginal prothallus. Areolae irregular, flat to subconcave, 0.5–0.7 mm diam., separated by deep cracks. Medulla I−. Apothecia common, rounded, lecideine, 1–(2–3) per areole, immersed at first, disc concave, becoming sessile with flat, roughened disc, (0.2–)0.25–0.3(–0.4) mm diam., margins scarely raised to 0.02 mm wide. Epithecium blue-black, 5–10 μm thick (K−,N+ red). Hymenium hyaline, I+ blue, 65–70 μm tall. Paraphyses simple or sparingly branched, 1.5–3 μm wide, apices swollen to 5 μm diam., blue-black (K−. N+ red). Hypothecium colourless, 20–30 μm thick. Asci cylindrical, 465–50 × 15–17 μm. Ascospores hyaline, 1(–2)-septate, 10–12 × 4–6 μm.

Chemistry : TLC−, all reactions negative.

C: Known only from the type locality. On hard limestone rocks.

Endemic

Catillaria glaucogrisea is characterised by: the saxicolous (basicolous rocks) habit; the pale-grey, areolate thallus; immersed to sessile, black, lecideine apothecia; a colourless hypothecium; a colourless hymenium, 65–70 μm tall; paraphyses with swollen, blue-black-pigmented apical caps; Catillaria -type asci; and hyaline, 1(–2)-septate ascospores, 10–12 × 4–6 μm.